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MAINTENANCE
4.10.7 AIR CONDITIONING FOR OPERATOR'S CAB - CHECK
REFRIGERANT LEVEL
Legend for illustration Z 22591
(1)
Air conditioner door with filter mat
(2)
Air conditioner unit
(3)
Sight glass for checking refrigerant filling
(4)
Shut-off valve on dryer cartridge
(5)
Dryer cartridge
(6)
Refrigerant collector reservoir
(7)
Condenser
(8)
Condenser blower
(9)
Low pressure switch
(10)
High pressure switch
(11)
Expansion valves
(12)
Evaporator blower
(13)
Evaporator
(14)
Cool air outlets
Checking the refrigerant level:
Switch on air conditioning equipment and run at maximum capac-
ity for approx. 5 minutes.
Observe inspection glass (3). A refrigerant flow loaded with bub-
bles or foam indicates a lack of refrigerant. In this case well
equipped refrigeration specialists must check the circuit for tight-
ness and must add the missing quantity or refrigerant. If more
than 200 grams per year are lost, the oil level of the refrigerant
compressor must also be checked. This is a special procedure
and must be carried out by refrigeration specialists only. Isolated
small bubbles in the inspection glass may be neglected.
Even with an absolutely tight equipment a certain amount of
refrigerant is lost through the walls of the hoses.
Therefore a small annual replenishment of the refrigerant quantity
is normal.
The dryer cartridge (5) must be replaced after every 1000 operat-
ing hours or once a year by refrigeration specialists.
Clean the filter mats of condenser (7) and evaporator (13).
REMARK
Servicing of the air conditioning systems is restricted to work-
shops especially equipped for this purpose. Refer to the separate
booklet "AIR CONDITIONING" in Service Literature Binder – Vol-
ume 2 for more information.
4.10 EVERY 250 OPERATING HOURS OR MONTHLY
387
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